100561045477 has 2 divisors, whose sum is σ = 100561045478. Its totient is φ = 100561045476.

The previous prime is 100561045451. The next prime is 100561045493. The reversal of 100561045477 is 774540165001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100514995681 + 46049796 = 317041^2 + 6786^2 .

It is a cyclic number.

It is not a de Polignac number, because 100561045477 - 2²⁷ = 100426827749 is a prime.

It is a super-2 number, since 2×100561045477² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100561045177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50280522738 + 50280522739.

It is an arithmetic number, because the mean of its divisors is an integer number (50280522739).

Almost surely, 2^100561045477 is an apocalyptic number.

It is an amenable number.

100561045477 is a deficient number, since it is larger than the sum of its proper divisors (1).

100561045477 is an equidigital number, since it uses as much as digits as its factorization.

100561045477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 117600, while the sum is 40.

The spelling of 100561045477 in words is "one hundred billion, five hundred sixty-one million, forty-five thousand, four hundred seventy-seven".