7149117778 has 32 divisors (see below), whose sum is σ = 11880711360. Its totient is φ = 3226220580.

The previous prime is 7149117739. The next prime is 7149117799. The reversal of 7149117778 is 8777119417.

It is a super-2 number, since 2×7149117778² (a number of 21 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, 51432433 + ... + 51432571.

It is an arithmetic number, because the mean of its divisors is an integer number (371272230).

Almost surely, 2^7149117778 is an apocalyptic number.

7149117778 is a deficient number, since it is larger than the sum of its proper divisors (4731593582).

7149117778 is an frugal number, since it uses more digits than its factorization.

7149117778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 152 counting only the distinct ones).

The product of its digits is 691488, while the sum is 52.

The square root of 7149117778 is about 84552.4557774640. The cubic root of 7149117778 is about 1926.4192852893.

The spelling of 7149117778 in words is "seven billion, one hundred forty-nine million, one hundred seventeen thousand, seven hundred seventy-eight".