65155557 has 16 divisors (see below), whose sum is σ = 90564032. Its totient is φ = 41627520.

The previous prime is 65155553. The next prime is 65155561. The reversal of 65155557 is 75555156.

It is an interprime number because it is at equal distance from previous prime (65155553) and next prime (65155561).

It is not a de Polignac number, because 65155557 - 2² = 65155553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65155553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3057 + ... + 11817.

It is an arithmetic number, because the mean of its divisors is an integer number (5660252).

Almost surely, 2^65155557 is an apocalyptic number.

65155557 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

65155557 is a deficient number, since it is larger than the sum of its proper divisors (25408475).

65155557 is a wasteful number, since it uses less digits than its factorization.

65155557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8868.

The product of its digits is 131250, while the sum is 39.

The square root of 65155557 is about 8071.8992188951. The cubic root of 65155557 is about 402.3930649658.

The spelling of 65155557 in words is "sixty-five million, one hundred fifty-five thousand, five hundred fifty-seven".