2156699066 has 16 divisors (see below), whose sum is σ = 3246899040. Its totient is φ = 1074407280.

The previous prime is 2156699059. The next prime is 2156699081. The reversal of 2156699066 is 6609966512.

It is a super-2 number, since 2×2156699066² = 9302701722570544712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 834965 + ... + 837543.

It is an arithmetic number, because the mean of its divisors is an integer number (202931190).

Almost surely, 2^2156699066 is an apocalyptic number.

2156699066 is a deficient number, since it is larger than the sum of its proper divisors (1090199974).

2156699066 is a wasteful number, since it uses less digits than its factorization.

2156699066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3949.

The product of its (nonzero) digits is 1049760, while the sum is 50.

The square root of 2156699066 is about 46440.2741809305. The cubic root of 2156699066 is about 1292.0019924918.

The spelling of 2156699066 in words is "two billion, one hundred fifty-six million, six hundred ninety-nine thousand, sixty-six".