501997772078 has 12 divisors (see below), whose sum is σ = 827674013040. Its totient is φ = 228180805380.

The previous prime is 501997772069. The next prime is 501997772137. The reversal of 501997772078 is 870277799105.

It is a self number, because there is not a number n which added to its sum of digits gives 501997772078.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1037185238 + ... + 1037185721.

It is an arithmetic number, because the mean of its divisors is an integer number (68972834420).

Almost surely, 2^501997772078 is an apocalyptic number.

501997772078 is a deficient number, since it is larger than the sum of its proper divisors (325676240962).

501997772078 is a wasteful number, since it uses less digits than its factorization.

501997772078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2074370983 (or 2074370972 counting only the distinct ones).

The product of its (nonzero) digits is 15558480, while the sum is 62.

The spelling of 501997772078 in words is "five hundred one billion, nine hundred ninety-seven million, seven hundred seventy-two thousand, seventy-eight".