261650650 has 24 divisors (see below), whose sum is σ = 487692000. Its totient is φ = 104440560.

The previous prime is 261650639. The next prime is 261650659. The reversal of 261650650 is 56056162.

It is a super-2 number, since 2×261650650² = 136922125290845000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261650659) 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, 19707 + ... + 30193.

It is an arithmetic number, because the mean of its divisors is an integer number (20320500).

Almost surely, 2^261650650 is an apocalyptic number.

261650650 is a deficient number, since it is larger than the sum of its proper divisors (226041350).

261650650 is a wasteful number, since it uses less digits than its factorization.

261650650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10998 (or 10993 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 261650650 is about 16175.6189989750. The cubic root of 261650650 is about 639.5982586135.

The spelling of 261650650 in words is "two hundred sixty-one million, six hundred fifty thousand, six hundred fifty".