761951661 has 16 divisors (see below), whose sum is σ = 1072804800. Its totient is φ = 479703168.

The previous prime is 761951657. The next prime is 761951681. The reversal of 761951661 is 166159167.

It is not a de Polignac number, because 761951661 - 2² = 761951657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (761951621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3016 + ... + 39153.

It is an arithmetic number, because the mean of its divisors is an integer number (67050300).

Almost surely, 2^761951661 is an apocalyptic number.

It is an amenable number.

761951661 is a deficient number, since it is larger than the sum of its proper divisors (310853139).

761951661 is a wasteful number, since it uses less digits than its factorization.

761951661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42508.

The product of its digits is 68040, while the sum is 42.

The square root of 761951661 is about 27603.4719011939. The cubic root of 761951661 is about 913.3610206885.

The spelling of 761951661 in words is "seven hundred sixty-one million, nine hundred fifty-one thousand, six hundred sixty-one".