78581661675 has 24 divisors (see below), whose sum is σ = 141732744000. Its totient is φ = 38100199200.

The previous prime is 78581661647. The next prime is 78581661709. The reversal of 78581661675 is 57616618587.

It is a happy number.

It is not a de Polignac number, because 78581661675 - 2⁵ = 78581661643 is a prime.

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, 47624425 + ... + 47626074.

It is an arithmetic number, because the mean of its divisors is an integer number (5905531000).

Almost surely, 2^78581661675 is an apocalyptic number.

78581661675 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

78581661675 is a deficient number, since it is larger than the sum of its proper divisors (63151082325).

78581661675 is a wasteful number, since it uses less digits than its factorization.

78581661675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95250523 (or 95250518 counting only the distinct ones).

The product of its digits is 16934400, while the sum is 60.

The spelling of 78581661675 in words is "seventy-eight billion, five hundred eighty-one million, six hundred sixty-one thousand, six hundred seventy-five".