261440706353724 has 144 divisors (see below), whose sum is σ = 713128249387008. Its totient is φ = 83683415469888.

The previous prime is 261440706353699. The next prime is 261440706353737. The reversal of 261440706353724 is 427353607044162.

261440706353724 is a `hidden beast` number, since 2 + 6 + 1 + 4 + 40 + 7 + 0 + 63 + 537 + 2 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51567492 + ... + 56409995.

It is an arithmetic number, because the mean of its divisors is an integer number (4952279509632).

Almost surely, 2^{261440706353724} is an apocalyptic number.

It is an amenable number.

261440706353724 is an abundant number, since it is smaller than the sum of its proper divisors (451687543033284).

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

261440706353724 is a wasteful number, since it uses less digits than its factorization.

261440706353724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107977606 (or 107977592 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 54.

The spelling of 261440706353724 in words is "two hundred sixty-one trillion, four hundred forty billion, seven hundred six million, three hundred fifty-three thousand, seven hundred twenty-four".