261554037772460 has 48 divisors (see below), whose sum is σ = 562044505272096. Its totient is φ = 102187198536192.

The previous prime is 261554037772429. The next prime is 261554037772477. The reversal of 261554037772460 is 64277730455162.

It is a happy number.

261554037772460 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 261554037772460.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64100744 + ... + 68058896.

It is an arithmetic number, because the mean of its divisors is an integer number (11709260526502).

Almost surely, 2^{261554037772460} is an apocalyptic number.

261554037772460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261554037772460 is an abundant number, since it is smaller than the sum of its proper divisors (300490467499636).

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

261554037772460 is a wasteful number, since it uses less digits than its factorization.

261554037772460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4035042 (or 4035040 counting only the distinct ones).

The product of its (nonzero) digits is 59270400, while the sum is 59.

The spelling of 261554037772460 in words is "two hundred sixty-one trillion, five hundred fifty-four billion, thirty-seven million, seven hundred seventy-two thousand, four hundred sixty".