10001978957 has 2 divisors, whose sum is σ = 10001978958. Its totient is φ = 10001978956.

The previous prime is 10001978939. The next prime is 10001978977. The reversal of 10001978957 is 75987910001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9819026281 + 182952676 = 99091^2 + 13526^2 .

It is a cyclic number.

It is not a de Polignac number, because 10001978957 - 2¹⁰ = 10001977933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10001978977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000989478 + 5000989479.

It is an arithmetic number, because the mean of its divisors is an integer number (5000989479).

Almost surely, 2^10001978957 is an apocalyptic number.

It is an amenable number.

10001978957 is a deficient number, since it is larger than the sum of its proper divisors (1).

10001978957 is an equidigital number, since it uses as much as digits as its factorization.

10001978957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 47.

The spelling of 10001978957 in words is "ten billion, one million, nine hundred seventy-eight thousand, nine hundred fifty-seven".