261432140477620 has 72 divisors (see below), whose sum is σ = 649818961593984. Its totient is φ = 86543053360512.

The previous prime is 261432140477597. The next prime is 261432140477633. The reversal of 261432140477620 is 26774041234162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1110091792 + ... + 1110327271.

It is an arithmetic number, because the mean of its divisors is an integer number (9025263355472).

Almost surely, 2^{261432140477620} is an apocalyptic number.

261432140477620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261432140477620 is an abundant number, since it is smaller than the sum of its proper divisors (388386821116364).

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

261432140477620 is a wasteful number, since it uses less digits than its factorization.

261432140477620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220419137 (or 2220419106 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 49.

The spelling of 261432140477620 in words is "two hundred sixty-one trillion, four hundred thirty-two billion, one hundred forty million, four hundred seventy-seven thousand, six hundred twenty".