1661476065 has 32 divisors (see below), whose sum is σ = 2712393216. Its totient is φ = 868158720.

The previous prime is 1661476057. The next prime is 1661476073. The reversal of 1661476065 is 5606741661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1661476057) and next prime (1661476073).

It is not a de Polignac number, because 1661476065 - 2³ = 1661476057 is a prime.

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, 887080 + ... + 888950.

It is an arithmetic number, because the mean of its divisors is an integer number (84762288).

Almost surely, 2^1661476065 is an apocalyptic number.

1661476065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1661476065 is a deficient number, since it is larger than the sum of its proper divisors (1050917151).

1661476065 is a wasteful number, since it uses less digits than its factorization.

1661476065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3049.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 1661476065 is about 40761.2078452050. The cubic root of 1661476065 is about 1184.3989937797.

The spelling of 1661476065 in words is "one billion, six hundred sixty-one million, four hundred seventy-six thousand, sixty-five".