1655015051 has 4 divisors (see below), whose sum is σ = 1657317600. Its totient is φ = 1652712504.

The previous prime is 1655015023. The next prime is 1655015057. The reversal of 1655015051 is 1505105561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1505105561 = 25321 ⋅59441.

It is a cyclic number.

It is not a de Polignac number, because 1655015051 - 2²² = 1650820747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1655015057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1150196 + ... + 1151633.

It is an arithmetic number, because the mean of its divisors is an integer number (414329400).

Almost surely, 2^1655015051 is an apocalyptic number.

1655015051 is a deficient number, since it is larger than the sum of its proper divisors (2302549).

1655015051 is an equidigital number, since it uses as much as digits as its factorization.

1655015051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302548.

The product of its (nonzero) digits is 3750, while the sum is 29.

The square root of 1655015051 is about 40681.8761981303. The cubic root of 1655015051 is about 1182.8617343318.

The spelling of 1655015051 in words is "one billion, six hundred fifty-five million, fifteen thousand, fifty-one".