1668515137 has 8 divisors (see below), whose sum is σ = 1695146432. Its totient is φ = 1641934800.

The previous prime is 1668515081. The next prime is 1668515141. The reversal of 1668515137 is 7315158661.

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 1668515137 - 2¹⁵ = 1668482369 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1668515093 and 1668515102.

It is not an unprimeable number, because it can be changed into a prime (1668515237) 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, 56212 + ... + 80602.

It is an arithmetic number, because the mean of its divisors is an integer number (211893304).

Almost surely, 2^1668515137 is an apocalyptic number.

It is an amenable number.

1668515137 is a deficient number, since it is larger than the sum of its proper divisors (26631295).

1668515137 is a wasteful number, since it uses less digits than its factorization.

1668515137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25479.

The product of its digits is 151200, while the sum is 43.

The square root of 1668515137 is about 40847.4618183309. The cubic root of 1668515137 is about 1186.0692603353.

The spelling of 1668515137 in words is "one billion, six hundred sixty-eight million, five hundred fifteen thousand, one hundred thirty-seven".