975377773621 has 2 divisors, whose sum is σ = 975377773622. Its totient is φ = 975377773620.

The previous prime is 975377773549. The next prime is 975377773691. The reversal of 975377773621 is 126377773579.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 919700180100 + 55677593521 = 959010^2 + 235961^2 .

It is a cyclic number.

It is not a de Polignac number, because 975377773621 - 2⁹ = 975377773109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (975377773691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 487688886810 + 487688886811.

It is an arithmetic number, because the mean of its divisors is an integer number (487688886811).

Almost surely, 2^975377773621 is an apocalyptic number.

It is an amenable number.

975377773621 is a deficient number, since it is larger than the sum of its proper divisors (1).

975377773621 is an equidigital number, since it uses as much as digits as its factorization.

975377773621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81682020, while the sum is 64.

The spelling of 975377773621 in words is "nine hundred seventy-five billion, three hundred seventy-seven million, seven hundred seventy-three thousand, six hundred twenty-one".