1660701561 has 8 divisors (see below), whose sum is σ = 2220542880. Its totient is φ = 1103997312.

The previous prime is 1660701557. The next prime is 1660701571. The reversal of 1660701561 is 1651070661.

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

It is not a de Polignac number, because 1660701561 - 2² = 1660701557 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1660701551) 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, 783031 + ... + 785148.

It is an arithmetic number, because the mean of its divisors is an integer number (277567860).

Almost surely, 2^1660701561 is an apocalyptic number.

It is an amenable number.

1660701561 is a deficient number, since it is larger than the sum of its proper divisors (559841319).

1660701561 is a wasteful number, since it uses less digits than its factorization.

1660701561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568535.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 1660701561 is about 40751.7062342180. The cubic root of 1660701561 is about 1184.2149276648.

The spelling of 1660701561 in words is "one billion, six hundred sixty million, seven hundred one thousand, five hundred sixty-one".