261440637361030 has 32 divisors (see below), whose sum is σ = 493023923205120. Its totient is φ = 99692337396960.

The previous prime is 261440637360979. The next prime is 261440637361031. The reversal of 261440637361030 is 30163736044162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261440637361031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6293687400 + ... + 6293728939.

It is an arithmetic number, because the mean of its divisors is an integer number (15406997600160).

Almost surely, 2^{261440637361030} is an apocalyptic number.

261440637361030 is a deficient number, since it is larger than the sum of its proper divisors (231583285844090).

261440637361030 is a wasteful number, since it uses less digits than its factorization.

261440637361030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12587416444.

The product of its (nonzero) digits is 1306368, while the sum is 46.

The spelling of 261440637361030 in words is "two hundred sixty-one trillion, four hundred forty billion, six hundred thirty-seven million, three hundred sixty-one thousand, thirty".