18761958947 has 2 divisors, whose sum is σ = 18761958948. Its totient is φ = 18761958946.

The previous prime is 18761958907. The next prime is 18761958959. The reversal of 18761958947 is 74985916781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18761958947 - 2²² = 18757764643 is a prime.

It is a super-2 number, since 2×18761958947² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18761958907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9380979473 + 9380979474.

It is an arithmetic number, because the mean of its divisors is an integer number (9380979474).

Almost surely, 2^18761958947 is an apocalyptic number.

18761958947 is a deficient number, since it is larger than the sum of its proper divisors (1).

18761958947 is an equidigital number, since it uses as much as digits as its factorization.

18761958947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30481920, while the sum is 65.

The spelling of 18761958947 in words is "eighteen billion, seven hundred sixty-one million, nine hundred fifty-eight thousand, nine hundred forty-seven".