1955318398929 has 27 divisors (see below), whose sum is σ = 3285516311337. Its totient is φ = 1117308019464.

The previous prime is 1955318398853. The next prime is 1955318398951. The reversal of 1955318398929 is 9298938135591.

The square root of 1955318398929 is 1398327.

It is a perfect power (a square), and thus also a powerful number.

1955318398929 is a `hidden beast` number, since 1 + 9 + 5 + 531 + 8 + 3 + 9 + 89 + 2 + 9 = 666.

It is not a de Polignac number, because 1955318398929 - 2²³ = 1955310010321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1955318398129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 29331574 + ... + 29398160.

Almost surely, 2^{1955318398929} is an apocalyptic number.

1955318398929 is the 1398327-th square number.

1955318398929 is the 699164-th centered octagonal number.

It is an amenable number.

1955318398929 is a deficient number, since it is larger than the sum of its proper divisors (1330197912408).

1955318398929 is an frugal number, since it uses more digits than its factorization.

1955318398929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133194 (or 66597 counting only the distinct ones).

The product of its digits is 188956800, while the sum is 72.

The spelling of 1955318398929 in words is "one trillion, nine hundred fifty-five billion, three hundred eighteen million, three hundred ninety-eight thousand, nine hundred twenty-nine".