1977585651553 has 2 divisors, whose sum is σ = 1977585651554. Its totient is φ = 1977585651552.

The previous prime is 1977585651521. The next prime is 1977585651557. The reversal of 1977585651553 is 3551565857791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1961254600704 + 16331050849 = 1400448^2 + 127793^2 .

It is a cyclic number.

It is not a de Polignac number, because 1977585651553 - 2⁵ = 1977585651521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1977585651557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 988792825776 + 988792825777.

It is an arithmetic number, because the mean of its divisors is an integer number (988792825777).

Almost surely, 2^{1977585651553} is an apocalyptic number.

It is an amenable number.

1977585651553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1977585651553 is an equidigital number, since it uses as much as digits as its factorization.

1977585651553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 198450000, while the sum is 67.

The spelling of 1977585651553 in words is "one trillion, nine hundred seventy-seven billion, five hundred eighty-five million, six hundred fifty-one thousand, five hundred fifty-three".