261251062000 has 40 divisors (see below), whose sum is σ = 631705072752. Its totient is φ = 104500424000.

The previous prime is 261251061943. The next prime is 261251062049. The reversal of 261251062000 is 260152162.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×261251062000² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

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, 65310766 + ... + 65314765.

Almost surely, 2^261251062000 is an apocalyptic number.

261251062000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261251062000 is an abundant number, since it is smaller than the sum of its proper divisors (370454010752).

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

261251062000 is a wasteful number, since it uses less digits than its factorization.

261251062000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130625554 (or 130625538 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The spelling of 261251062000 in words is "two hundred sixty-one billion, two hundred fifty-one million, sixty-two thousand".