19730153957 has 2 divisors, whose sum is σ = 19730153958. Its totient is φ = 19730153956.

The previous prime is 19730153899. The next prime is 19730153977. The reversal of 19730153957 is 75935103791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17309612356 + 2420541601 = 131566^2 + 49199^2 .

It is an emirp because it is prime and its reverse (75935103791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19730153957 - 2²⁰ = 19729105381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19730153977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9865076978 + 9865076979.

It is an arithmetic number, because the mean of its divisors is an integer number (9865076979).

Almost surely, 2^19730153957 is an apocalyptic number.

It is an amenable number.

19730153957 is a deficient number, since it is larger than the sum of its proper divisors (1).

19730153957 is an equidigital number, since it uses as much as digits as its factorization.

19730153957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 893025, while the sum is 50.

The spelling of 19730153957 in words is "nineteen billion, seven hundred thirty million, one hundred fifty-three thousand, nine hundred fifty-seven".