19523977966078 has 4 divisors (see below), whose sum is σ = 29285966949120. Its totient is φ = 9761988983038.

The previous prime is 19523977965983. The next prime is 19523977966093. The reversal of 19523977966078 is 87066977932591.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 19523977965989 and 19523977966007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4880994491518 + ... + 4880994491521.

It is an arithmetic number, because the mean of its divisors is an integer number (7321491737280).

Almost surely, 2^{19523977966078} is an apocalyptic number.

19523977966078 is a deficient number, since it is larger than the sum of its proper divisors (9761988983042).

19523977966078 is an equidigital number, since it uses as much as digits as its factorization.

19523977966078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9761988983041.

The product of its (nonzero) digits is 2160406080, while the sum is 79.

The spelling of 19523977966078 in words is "nineteen trillion, five hundred twenty-three billion, nine hundred seventy-seven million, nine hundred sixty-six thousand, seventy-eight".