1016515661 has 8 divisors (see below), whose sum is σ = 1181423040. Its totient is φ = 856531008.

The previous prime is 1016515609. The next prime is 1016515693. The reversal of 1016515661 is 1665156101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1016515661 - 2⁶ = 1016515597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1016515601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1230236 + ... + 1231061.

It is an arithmetic number, because the mean of its divisors is an integer number (147677880).

Almost surely, 2^1016515661 is an apocalyptic number.

It is an amenable number.

1016515661 is a deficient number, since it is larger than the sum of its proper divisors (164907379).

1016515661 is an equidigital number, since it uses as much as digits as its factorization.

1016515661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2461363.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 1016515661 is about 31882.8427371212. The cubic root of 1016515661 is about 1005.4751879392.

The spelling of 1016515661 in words is "one billion, sixteen million, five hundred fifteen thousand, six hundred sixty-one".