250561631550 has 24 divisors (see below), whose sum is σ = 621392846616. Its totient is φ = 66816435040.

The previous prime is 250561631543. The next prime is 250561631557. The reversal of 250561631550 is 55136165052.

It is an interprime number because it is at equal distance from previous prime (250561631543) and next prime (250561631557).

It is a super-2 number, since 2×250561631550² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 250561631499 and 250561631508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (250561631557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 835205289 + ... + 835205588.

It is an arithmetic number, because the mean of its divisors is an integer number (25891368609).

Almost surely, 2^250561631550 is an apocalyptic number.

250561631550 is an abundant number, since it is smaller than the sum of its proper divisors (370831215066).

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

250561631550 is a wasteful number, since it uses less digits than its factorization.

250561631550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670410892 (or 1670410887 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 39.

The spelling of 250561631550 in words is "two hundred fifty billion, five hundred sixty-one million, six hundred thirty-one thousand, five hundred fifty".