668051431501 has 2 divisors, whose sum is σ = 668051431502. Its totient is φ = 668051431500.

The previous prime is 668051431303. The next prime is 668051431517. The reversal of 668051431501 is 105134150866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 540335255625 + 127716175876 = 735075^2 + 357374^2 .

It is a cyclic number.

It is not a de Polignac number, because 668051431501 - 2¹³ = 668051423309 is a prime.

It is a super-2 number, since 2×668051431501² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668051431571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334025715750 + 334025715751.

It is an arithmetic number, because the mean of its divisors is an integer number (334025715751).

Almost surely, 2^668051431501 is an apocalyptic number.

It is an amenable number.

668051431501 is a deficient number, since it is larger than the sum of its proper divisors (1).

668051431501 is an equidigital number, since it uses as much as digits as its factorization.

668051431501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 668051431501 in words is "six hundred sixty-eight billion, fifty-one million, four hundred thirty-one thousand, five hundred one".