79621780445 has 32 divisors (see below), whose sum is σ = 100028597760. Its totient is φ = 60779292160.

The previous prime is 79621780331. The next prime is 79621780457. The reversal of 79621780445 is 54408712697.

It is a de Polignac number, because none of the positive numbers 2^k-79621780445 is a prime.

It is a congruent 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, 26870534 + ... + 26873496.

It is an arithmetic number, because the mean of its divisors is an integer number (3125893680).

Almost surely, 2^79621780445 is an apocalyptic number.

It is an amenable number.

79621780445 is a deficient number, since it is larger than the sum of its proper divisors (20406817315).

79621780445 is a wasteful number, since it uses less digits than its factorization.

79621780445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5845.

The product of its (nonzero) digits is 3386880, while the sum is 53.

The spelling of 79621780445 in words is "seventy-nine billion, six hundred twenty-one million, seven hundred eighty thousand, four hundred forty-five".