766531609128 has 96 divisors (see below), whose sum is σ = 2087141696640. Its totient is φ = 254145114240.

The previous prime is 766531609117. The next prime is 766531609139. The reversal of 766531609128 is 821906135667.

766531609128 is a `hidden beast` number, since 7 + 6 + 6 + 5 + 3 + 1 + 609 + 1 + 28 = 666.

It is an interprime number because it is at equal distance from previous prime (766531609117) and next prime (766531609139).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12334213 + ... + 12396203.

It is an arithmetic number, because the mean of its divisors is an integer number (21741059340).

Almost surely, 2^766531609128 is an apocalyptic number.

It is an amenable number.

766531609128 is an abundant number, since it is smaller than the sum of its proper divisors (1320610087512).

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

766531609128 is a wasteful number, since it uses less digits than its factorization.

766531609128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62919 (or 62912 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 766531609128 in words is "seven hundred sixty-six billion, five hundred thirty-one million, six hundred nine thousand, one hundred twenty-eight".