2561651332432 has 40 divisors (see below), whose sum is σ = 5281828376616. Its totient is φ = 1199363751936.

The previous prime is 2561651332411. The next prime is 2561651332463. The reversal of 2561651332432 is 2342331561652.

It can be written as a sum of positive squares in 4 ways, for example, as 1559161784896 + 1002489547536 = 1248664^2 + 1001244^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23849553 + ... + 23956720.

Almost surely, 2^{2561651332432} is an apocalyptic number.

It is an amenable number.

2561651332432 is an abundant number, since it is smaller than the sum of its proper divisors (2720177044184).

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

2561651332432 is a wasteful number, since it uses less digits than its factorization.

2561651332432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47806495 (or 47806489 counting only the distinct ones).

The product of its digits is 777600, while the sum is 43.

The spelling of 2561651332432 in words is "two trillion, five hundred sixty-one billion, six hundred fifty-one million, three hundred thirty-two thousand, four hundred thirty-two".