77666345470 has 32 divisors (see below), whose sum is σ = 159851060928. Its totient is φ = 26615079168.

The previous prime is 77666345431. The next prime is 77666345507. The reversal of 77666345470 is 7454366677.

It is a super-2 number, since 2×77666345470² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138007 + ... + 417586.

It is an arithmetic number, because the mean of its divisors is an integer number (4995345654).

Almost surely, 2^77666345470 is an apocalyptic number.

77666345470 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

77666345470 is an abundant number, since it is smaller than the sum of its proper divisors (82184715458).

77666345470 is a wasteful number, since it uses less digits than its factorization.

77666345470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557604.

The product of its (nonzero) digits is 17781120, while the sum is 55.

The spelling of 77666345470 in words is "seventy-seven billion, six hundred sixty-six million, three hundred forty-five thousand, four hundred seventy".