1955216677 has 2 divisors, whose sum is σ = 1955216678. Its totient is φ = 1955216676.

The previous prime is 1955216621. The next prime is 1955216687. The reversal of 1955216677 is 7766125591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1704120961 + 251095716 = 41281^2 + 15846^2 .

It is a cyclic number.

It is not a de Polignac number, because 1955216677 - 2²³ = 1946828069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1955216677.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1955216617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977608338 + 977608339.

It is an arithmetic number, because the mean of its divisors is an integer number (977608339).

Almost surely, 2^1955216677 is an apocalyptic number.

It is an amenable number.

1955216677 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955216677 is an equidigital number, since it uses as much as digits as its factorization.

1955216677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 793800, while the sum is 49.

The square root of 1955216677 is about 44217.8321155617. The cubic root of 1955216677 is about 1250.4460652284.

The spelling of 1955216677 in words is "one billion, nine hundred fifty-five million, two hundred sixteen thousand, six hundred seventy-seven".