7156721902 has 24 divisors (see below), whose sum is σ = 11885903568. Its totient is φ = 3229295520.

The previous prime is 7156721881. The next prime is 7156721909. The reversal of 7156721902 is 2091276517.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7156721909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74778 + ... + 141085.

It is an arithmetic number, because the mean of its divisors is an integer number (495245982).

Almost surely, 2^7156721902 is an apocalyptic number.

7156721902 is a deficient number, since it is larger than the sum of its proper divisors (4729181666).

7156721902 is a wasteful number, since it uses less digits than its factorization.

7156721902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216024 (or 216013 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 7156721902 is about 84597.4107286978. The cubic root of 7156721902 is about 1927.1020520753.

The spelling of 7156721902 in words is "seven billion, one hundred fifty-six million, seven hundred twenty-one thousand, nine hundred two".