1660157497 has 4 divisors (see below), whose sum is σ = 1665495936. Its totient is φ = 1654819060.

The previous prime is 1660157479. The next prime is 1660157501. The reversal of 1660157497 is 7947510661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1660157497 - 2¹¹ = 1660155449 is a prime.

It is a super-2 number, since 2×1660157497² = 5512245829690610018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1660157417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2668753 + ... + 2669374.

It is an arithmetic number, because the mean of its divisors is an integer number (416373984).

Almost surely, 2^1660157497 is an apocalyptic number.

It is an amenable number.

1660157497 is a deficient number, since it is larger than the sum of its proper divisors (5338439).

1660157497 is an equidigital number, since it uses as much as digits as its factorization.

1660157497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5338438.

The product of its (nonzero) digits is 317520, while the sum is 46.

The square root of 1660157497 is about 40745.0303349991. The cubic root of 1660157497 is about 1184.0855929513.

The spelling of 1660157497 in words is "one billion, six hundred sixty million, one hundred fifty-seven thousand, four hundred ninety-seven".