691600415660 has 48 divisors (see below), whose sum is σ = 1810735637760. Its totient is φ = 215563765440.

The previous prime is 691600415651. The next prime is 691600415669. The reversal of 691600415660 is 66514006196.

It is an interprime number because it is at equal distance from previous prime (691600415651) and next prime (691600415669).

It is a super-2 number, since 2×691600415660² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (691600415669) 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, 224544050 + ... + 224547129.

It is an arithmetic number, because the mean of its divisors is an integer number (37723659120).

Almost surely, 2^691600415660 is an apocalyptic number.

It is an amenable number.

691600415660 is an abundant number, since it is smaller than the sum of its proper divisors (1119135222100).

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

691600415660 is a wasteful number, since it uses less digits than its factorization.

691600415660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449091206 (or 449091204 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 44.

The spelling of 691600415660 in words is "six hundred ninety-one billion, six hundred million, four hundred fifteen thousand, six hundred sixty".