100978455797 has 2 divisors, whose sum is σ = 100978455798. Its totient is φ = 100978455796.

The previous prime is 100978455769. The next prime is 100978455803. The reversal of 100978455797 is 797554879001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82616579761 + 18361876036 = 287431^2 + 135506^2 .

It is a cyclic number.

It is not a de Polignac number, because 100978455797 - 2⁶ = 100978455733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100978452797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50489227898 + 50489227899.

It is an arithmetic number, because the mean of its divisors is an integer number (50489227899).

Almost surely, 2^100978455797 is an apocalyptic number.

It is an amenable number.

100978455797 is a deficient number, since it is larger than the sum of its proper divisors (1).

100978455797 is an equidigital number, since it uses as much as digits as its factorization.

100978455797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22226400, while the sum is 62.

The spelling of 100978455797 in words is "one hundred billion, nine hundred seventy-eight million, four hundred fifty-five thousand, seven hundred ninety-seven".