1406646398977 has 2 divisors, whose sum is σ = 1406646398978. Its totient is φ = 1406646398976.

The previous prime is 1406646398887. The next prime is 1406646399007. The reversal of 1406646398977 is 7798936466041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1343376039681 + 63270359296 = 1159041^2 + 251536^2 .

It is a cyclic number.

It is not a de Polignac number, because 1406646398977 - 2³¹ = 1404498915329 is a prime.

It is a super-2 number, since 2×1406646398977² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1406646398777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 703323199488 + 703323199489.

It is an arithmetic number, because the mean of its divisors is an integer number (703323199489).

Almost surely, 2^{1406646398977} is an apocalyptic number.

It is an amenable number.

1406646398977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1406646398977 is an equidigital number, since it uses as much as digits as its factorization.

1406646398977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 329204736, while the sum is 70.

The spelling of 1406646398977 in words is "one trillion, four hundred six billion, six hundred forty-six million, three hundred ninety-eight thousand, nine hundred seventy-seven".