400767194621 has 2 divisors, whose sum is σ = 400767194622. Its totient is φ = 400767194620.

The previous prime is 400767194609. The next prime is 400767194623. The reversal of 400767194621 is 126491767004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 351398798521 + 49368396100 = 592789^2 + 222190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400767194621 is a prime.

It is a super-2 number, since 2×400767194621² (a number of 24 digits) contains 22 as substring.

Together with 400767194623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400767194623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200383597310 + 200383597311.

It is an arithmetic number, because the mean of its divisors is an integer number (200383597311).

Almost surely, 2^400767194621 is an apocalyptic number.

It is an amenable number.

400767194621 is a deficient number, since it is larger than the sum of its proper divisors (1).

400767194621 is an equidigital number, since it uses as much as digits as its factorization.

400767194621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 400767194621 in words is "four hundred billion, seven hundred sixty-seven million, one hundred ninety-four thousand, six hundred twenty-one".