26615653640 has 32 divisors (see below), whose sum is σ = 61950231000. Its totient is φ = 10279148544.

The previous prime is 26615653637. The next prime is 26615653643. The reversal of 26615653640 is 4635651662.

It is an interprime number because it is at equal distance from previous prime (26615653637) and next prime (26615653643).

It can be written as a sum of positive squares in 4 ways, for example, as 17313822724 + 9301830916 = 131582^2 + 96446^2 .

It is a junction number, because it is equal to n+sod(n) for n = 26615653591 and 26615653600.

It is not an unprimeable number, because it can be changed into a prime (26615653643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11471105 + ... + 11473424.

Almost surely, 2^26615653640 is an apocalyptic number.

26615653640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26615653640 is an abundant number, since it is smaller than the sum of its proper divisors (35334577360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26615653640 is a wasteful number, since it uses less digits than its factorization.

26615653640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22944569 (or 22944565 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 26615653640 in words is "twenty-six billion, six hundred fifteen million, six hundred fifty-three thousand, six hundred forty".