19790971377 has 4 divisors (see below), whose sum is σ = 26387961840. Its totient is φ = 13193980916.

The previous prime is 19790971351. The next prime is 19790971393. The reversal of 19790971377 is 77317909791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19790971377 - 2⁶ = 19790971313 is a prime.

It is a super-2 number, since 2×19790971377² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19790971377.

It is not an unprimeable number, because it can be changed into a prime (19790971177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3298495227 + ... + 3298495232.

It is an arithmetic number, because the mean of its divisors is an integer number (6596990460).

Almost surely, 2^19790971377 is an apocalyptic number.

It is an amenable number.

19790971377 is a deficient number, since it is larger than the sum of its proper divisors (6596990463).

19790971377 is an equidigital number, since it uses as much as digits as its factorization.

19790971377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6596990462.

The product of its (nonzero) digits is 5250987, while the sum is 60.

The spelling of 19790971377 in words is "nineteen billion, seven hundred ninety million, nine hundred seventy-one thousand, three hundred seventy-seven".