400642324157 has 2 divisors, whose sum is σ = 400642324158. Its totient is φ = 400642324156.

The previous prime is 400642324021. The next prime is 400642324169. The reversal of 400642324157 is 751423246004.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 385915530841 + 14726793316 = 621221^2 + 121354^2 .

It is a cyclic number.

It is not a de Polignac number, because 400642324157 - 2¹⁴ = 400642307773 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400642324157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400642524157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200321162078 + 200321162079.

It is an arithmetic number, because the mean of its divisors is an integer number (200321162079).

Almost surely, 2^400642324157 is an apocalyptic number.

It is an amenable number.

400642324157 is a deficient number, since it is larger than the sum of its proper divisors (1).

400642324157 is an equidigital number, since it uses as much as digits as its factorization.

400642324157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 38.

The spelling of 400642324157 in words is "four hundred billion, six hundred forty-two million, three hundred twenty-four thousand, one hundred fifty-seven".