400000000061 has 2 divisors, whose sum is σ = 400000000062. Its totient is φ = 400000000060.

The previous prime is 400000000019. The next prime is 400000000063. The reversal of 400000000061 is 160000000004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211899105625 + 188100894436 = 460325^2 + 433706^2 .

It is a cyclic number.

It is not a de Polignac number, because 400000000061 - 2²² = 399995805757 is a prime.

Together with 400000000063, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 399999999970 and 400000000051.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400000000063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200000000030 + 200000000031.

It is an arithmetic number, because the mean of its divisors is an integer number (200000000031).

Almost surely, 2^400000000061 is an apocalyptic number.

It is an amenable number.

400000000061 is a deficient number, since it is larger than the sum of its proper divisors (1).

400000000061 is an equidigital number, since it uses as much as digits as its factorization.

400000000061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 400000000061 its reverse (160000000004), we get a palindrome (560000000065).

The spelling of 400000000061 in words is "four hundred billion, sixty-one", and thus it is an aban number.