100219978961 has 2 divisors, whose sum is σ = 100219978962. Its totient is φ = 100219978960.

The previous prime is 100219978939. The next prime is 100219978979. The reversal of 100219978961 is 169879912001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90899235025 + 9320743936 = 301495^2 + 96544^2 .

It is a cyclic number.

It is not a de Polignac number, because 100219978961 - 2⁶ = 100219978897 is a prime.

It is not a weakly prime, because it can be changed into another prime (100219918961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50109989480 + 50109989481.

It is an arithmetic number, because the mean of its divisors is an integer number (50109989481).

Almost surely, 2^100219978961 is an apocalyptic number.

It is an amenable number.

100219978961 is a deficient number, since it is larger than the sum of its proper divisors (1).

100219978961 is an equidigital number, since it uses as much as digits as its factorization.

100219978961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 53.

The spelling of 100219978961 in words is "one hundred billion, two hundred nineteen million, nine hundred seventy-eight thousand, nine hundred sixty-one".