6915525981 has 16 divisors (see below), whose sum is σ = 11348555904. Its totient is φ = 3647749824.

The previous prime is 6915525941. The next prime is 6915525983. The reversal of 6915525981 is 1895255196.

It is not a de Polignac number, because 6915525981 - 2¹¹ = 6915523933 is a prime.

It is a super-2 number, since 2×6915525981² = 95648999187772024722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6915525983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12665526 + ... + 12666071.

It is an arithmetic number, because the mean of its divisors is an integer number (709284744).

Almost surely, 2^6915525981 is an apocalyptic number.

It is an amenable number.

6915525981 is a deficient number, since it is larger than the sum of its proper divisors (4433029923).

6915525981 is a wasteful number, since it uses less digits than its factorization.

6915525981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25331620.

The product of its digits is 972000, while the sum is 51.

The square root of 6915525981 is about 83159.6415396315. The cubic root of 6915525981 is about 1905.2051162085.

The spelling of 6915525981 in words is "six billion, nine hundred fifteen million, five hundred twenty-five thousand, nine hundred eighty-one".