72155464232312 has 8 divisors (see below), whose sum is σ = 135291495435600. Its totient is φ = 36077732116152.

The previous prime is 72155464232287. The next prime is 72155464232329. The reversal of 72155464232312 is 21323246455127.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×72155464232312² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4509716514512 + ... + 4509716514527.

It is an arithmetic number, because the mean of its divisors is an integer number (16911436929450).

Almost surely, 2^{72155464232312} is an apocalyptic number.

It is an amenable number.

72155464232312 is a deficient number, since it is larger than the sum of its proper divisors (63136031203288).

72155464232312 is a wasteful number, since it uses less digits than its factorization.

72155464232312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9019433029045 (or 9019433029041 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 47.

The spelling of 72155464232312 in words is "seventy-two trillion, one hundred fifty-five billion, four hundred sixty-four million, two hundred thirty-two thousand, three hundred twelve".