1618656051 has 4 divisors (see below), whose sum is σ = 2158208072. Its totient is φ = 1079104032.

The previous prime is 1618656019. The next prime is 1618656101. The reversal of 1618656051 is 1506568161.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1618656051 - 2⁵ = 1618656019 is a prime.

It is a super-2 number, since 2×1618656051² = 5240094822877829202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1618156051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269776006 + ... + 269776011.

It is an arithmetic number, because the mean of its divisors is an integer number (539552018).

Almost surely, 2^1618656051 is an apocalyptic number.

1618656051 is a deficient number, since it is larger than the sum of its proper divisors (539552021).

1618656051 is an equidigital number, since it uses as much as digits as its factorization.

1618656051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539552020.

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 1618656051 is about 40232.5247902739. The cubic root of 1618656051 is about 1174.1354258033.

The spelling of 1618656051 in words is "one billion, six hundred eighteen million, six hundred fifty-six thousand, fifty-one".