1172152721155 has 16 divisors (see below), whose sum is σ = 1514846773440. Its totient is φ = 865552675968.

The previous prime is 1172152721141. The next prime is 1172152721209. The reversal of 1172152721155 is 5511272512711.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1172152721155 - 2¹³ = 1172152712963 is a prime.

It is a super-2 number, since 2×1172152721155² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1195026 + ... + 1942264.

It is an arithmetic number, because the mean of its divisors is an integer number (94677923340).

Almost surely, 2^{1172152721155} is an apocalyptic number.

1172152721155 is a deficient number, since it is larger than the sum of its proper divisors (342694052285).

1172152721155 is a wasteful number, since it uses less digits than its factorization.

1172152721155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771390.

The product of its digits is 49000, while the sum is 40.

The spelling of 1172152721155 in words is "one trillion, one hundred seventy-two billion, one hundred fifty-two million, seven hundred twenty-one thousand, one hundred fifty-five".