18915137707 has 2 divisors, whose sum is σ = 18915137708. Its totient is φ = 18915137706.

The previous prime is 18915137699. The next prime is 18915137713. The reversal of 18915137707 is 70773151981.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18915137707 - 2³ = 18915137699 is a prime.

It is not a weakly prime, because it can be changed into another prime (18915137767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9457568853 + 9457568854.

It is an arithmetic number, because the mean of its divisors is an integer number (9457568854).

Almost surely, 2^18915137707 is an apocalyptic number.

18915137707 is a deficient number, since it is larger than the sum of its proper divisors (1).

18915137707 is an equidigital number, since it uses as much as digits as its factorization.

18915137707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 370440, while the sum is 49.

The spelling of 18915137707 in words is "eighteen billion, nine hundred fifteen million, one hundred thirty-seven thousand, seven hundred seven".