261377763744 has 48 divisors (see below), whose sum is σ = 709775831520. Its totient is φ = 84121578240.

The previous prime is 261377763727. The next prime is 261377763761. The reversal of 261377763744 is 447367773162.

It is an interprime number because it is at equal distance from previous prime (261377763727) and next prime (261377763761).

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46940062 + ... + 46945629.

It is an arithmetic number, because the mean of its divisors is an integer number (14786996490).

Almost surely, 2^261377763744 is an apocalyptic number.

261377763744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

261377763744 is an abundant number, since it is smaller than the sum of its proper divisors (448398067776).

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

261377763744 is a wasteful number, since it uses less digits than its factorization.

261377763744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93885733 (or 93885725 counting only the distinct ones).

The product of its digits is 24893568, while the sum is 57.

The spelling of 261377763744 in words is "two hundred sixty-one billion, three hundred seventy-seven million, seven hundred sixty-three thousand, seven hundred forty-four".