261553766016036 has 96 divisors (see below), whose sum is σ = 663631943869440. Its totient is φ = 79695140743296.

The previous prime is 261553766015963. The next prime is 261553766016043. The reversal of 261553766016036 is 630610667355162.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 984562435 + ... + 984828053.

It is an arithmetic number, because the mean of its divisors is an integer number (6912832748640).

Almost surely, 2^{261553766016036} is an apocalyptic number.

261553766016036 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

261553766016036 is an abundant number, since it is smaller than the sum of its proper divisors (402078177853404).

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

261553766016036 is a wasteful number, since it uses less digits than its factorization.

261553766016036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327025 (or 327023 counting only the distinct ones).

The product of its (nonzero) digits is 24494400, while the sum is 57.

The spelling of 261553766016036 in words is "two hundred sixty-one trillion, five hundred fifty-three billion, seven hundred sixty-six million, sixteen thousand, thirty-six".