779157538945 has 4 divisors (see below), whose sum is σ = 934989046740. Its totient is φ = 623326031152.

The previous prime is 779157538891. The next prime is 779157538969. The reversal of 779157538945 is 549835751977.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 307275096976 + 471882441969 = 554324^2 + 686937^2 .

It is a cyclic number.

It is not a de Polignac number, because 779157538945 - 2¹¹ = 779157536897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77915753890 + ... + 77915753899.

It is an arithmetic number, because the mean of its divisors is an integer number (233747261685).

Almost surely, 2^779157538945 is an apocalyptic number.

It is an amenable number.

779157538945 is a deficient number, since it is larger than the sum of its proper divisors (155831507795).

779157538945 is a wasteful number, since it uses less digits than its factorization.

779157538945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155831507794.

The product of its digits is 333396000, while the sum is 70.

The spelling of 779157538945 in words is "seven hundred seventy-nine billion, one hundred fifty-seven million, five hundred thirty-eight thousand, nine hundred forty-five".