78921593465 has 32 divisors (see below), whose sum is σ = 111945649536. Its totient is φ = 52657205760.

The previous prime is 78921593449. The next prime is 78921593473. The reversal of 78921593465 is 56439512987.

It is a happy number.

It is not a de Polignac number, because 78921593465 - 2⁴ = 78921593449 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 222044 + ... + 455133.

It is an arithmetic number, because the mean of its divisors is an integer number (3498301548).

Almost surely, 2^78921593465 is an apocalyptic number.

It is an amenable number.

78921593465 is a deficient number, since it is larger than the sum of its proper divisors (33024056071).

78921593465 is a wasteful number, since it uses less digits than its factorization.

78921593465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677369.

The product of its digits is 16329600, while the sum is 59.

The spelling of 78921593465 in words is "seventy-eight billion, nine hundred twenty-one million, five hundred ninety-three thousand, four hundred sixty-five".