25640734704321 has 32 divisors (see below), whose sum is σ = 39317934458880. Its totient is φ = 14699680459200.

The previous prime is 25640734704317. The next prime is 25640734704371. The reversal of 25640734704321 is 12340743704652.

It is not a de Polignac number, because 25640734704321 - 2² = 25640734704317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25640734704371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30519225 + ... + 31348118.

It is an arithmetic number, because the mean of its divisors is an integer number (1228685451840).

Almost surely, 2^{25640734704321} is an apocalyptic number.

It is an amenable number.

25640734704321 is a deficient number, since it is larger than the sum of its proper divisors (13677199754559).

25640734704321 is a wasteful number, since it uses less digits than its factorization.

25640734704321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61868037.

The product of its (nonzero) digits is 3386880, while the sum is 48.

The spelling of 25640734704321 in words is "twenty-five trillion, six hundred forty billion, seven hundred thirty-four million, seven hundred four thousand, three hundred twenty-one".