400874977693 has 2 divisors, whose sum is σ = 400874977694. Its totient is φ = 400874977692.

The previous prime is 400874977691. The next prime is 400874977729. The reversal of 400874977693 is 396779478004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 356960841444 + 43914136249 = 597462^2 + 209557^2 .

It is a cyclic number.

It is not a de Polignac number, because 400874977693 - 2¹ = 400874977691 is a prime.

Together with 400874977691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400874977691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200437488846 + 200437488847.

It is an arithmetic number, because the mean of its divisors is an integer number (200437488847).

Almost surely, 2^400874977693 is an apocalyptic number.

It is an amenable number.

400874977693 is a deficient number, since it is larger than the sum of its proper divisors (1).

400874977693 is an equidigital number, since it uses as much as digits as its factorization.

400874977693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64012032, while the sum is 64.

The spelling of 400874977693 in words is "four hundred billion, eight hundred seventy-four million, nine hundred seventy-seven thousand, six hundred ninety-three".