20377925591 has 2 divisors, whose sum is σ = 20377925592. Its totient is φ = 20377925590.

The previous prime is 20377925567. The next prime is 20377925597. The reversal of 20377925591 is 19552977302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20377925591 - 2¹⁸ = 20377663447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20377925597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10188962795 + 10188962796.

It is an arithmetic number, because the mean of its divisors is an integer number (10188962796).

Almost surely, 2^20377925591 is an apocalyptic number.

20377925591 is a deficient number, since it is larger than the sum of its proper divisors (1).

20377925591 is an equidigital number, since it uses as much as digits as its factorization.

20377925591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1190700, while the sum is 50.

The spelling of 20377925591 in words is "twenty billion, three hundred seventy-seven million, nine hundred twenty-five thousand, five hundred ninety-one".