1331177903977 has 2 divisors, whose sum is σ = 1331177903978. Its totient is φ = 1331177903976.

The previous prime is 1331177903953. The next prime is 1331177904029. The reversal of 1331177903977 is 7793097711331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1278683762521 + 52494141456 = 1130789^2 + 229116^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331177903977 is a prime.

It is a super-2 number, since 2×1331177903977² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1331177900977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665588951988 + 665588951989.

It is an arithmetic number, because the mean of its divisors is an integer number (665588951989).

Almost surely, 2^{1331177903977} is an apocalyptic number.

It is an amenable number.

1331177903977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331177903977 is an equidigital number, since it uses as much as digits as its factorization.

1331177903977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5250987, while the sum is 58.

The spelling of 1331177903977 in words is "one trillion, three hundred thirty-one billion, one hundred seventy-seven million, nine hundred three thousand, nine hundred seventy-seven".