19523977966079 has 4 divisors (see below), whose sum is σ = 19854892846920. Its totient is φ = 19193063085240.

The previous prime is 19523977965983. The next prime is 19523977966093. The reversal of 19523977966079 is 97066977932591.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19523977966079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19523977965994 and 19523977966012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19523977966379) 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, 165457440332 + ... + 165457440449.

It is an arithmetic number, because the mean of its divisors is an integer number (4963723211730).

Almost surely, 2^{19523977966079} is an apocalyptic number.

19523977966079 is a deficient number, since it is larger than the sum of its proper divisors (330914880841).

19523977966079 is an equidigital number, since it uses as much as digits as its factorization.

19523977966079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330914880840.

The product of its (nonzero) digits is 2430456840, while the sum is 80.

The spelling of 19523977966079 in words is "nineteen trillion, five hundred twenty-three billion, nine hundred seventy-seven million, nine hundred sixty-six thousand, seventy-nine".