1955397065 has 32 divisors (see below), whose sum is σ = 2564352000. Its totient is φ = 1425731328.

The previous prime is 1955397047. The next prime is 1955397089. The reversal of 1955397065 is 5607935591.

It is a cyclic number.

It is not a de Polignac number, because 1955397065 - 2¹⁰ = 1955396041 is a prime.

It is a super-2 number, since 2×1955397065² = 7647155363621228450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 872216 + ... + 874454.

It is an arithmetic number, because the mean of its divisors is an integer number (80136000).

Almost surely, 2^1955397065 is an apocalyptic number.

It is an amenable number.

1955397065 is a deficient number, since it is larger than the sum of its proper divisors (608954935).

1955397065 is a wasteful number, since it uses less digits than its factorization.

1955397065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2609.

The product of its (nonzero) digits is 1275750, while the sum is 50.

The square root of 1955397065 is about 44219.8718338260. The cubic root of 1955397065 is about 1250.4845193685.

The spelling of 1955397065 in words is "one billion, nine hundred fifty-five million, three hundred ninety-seven thousand, sixty-five".