1645787157 has 12 divisors (see below), whose sum is σ = 2552649696. Its totient is φ = 940449720.

The previous prime is 1645787147. The next prime is 1645787161. The reversal of 1645787157 is 7517875461.

It is not a de Polignac number, because 1645787157 - 2⁴ = 1645787141 is a prime.

It is a super-2 number, since 2×1645787157² = 5417230732292285298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645787107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5597769 + ... + 5598062.

It is an arithmetic number, because the mean of its divisors is an integer number (212720808).

Almost surely, 2^1645787157 is an apocalyptic number.

It is an amenable number.

1645787157 is a deficient number, since it is larger than the sum of its proper divisors (906862539).

1645787157 is a wasteful number, since it uses less digits than its factorization.

1645787157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11195848 (or 11195841 counting only the distinct ones).

The product of its digits is 1646400, while the sum is 51.

The square root of 1645787157 is about 40568.3023677353. The cubic root of 1645787157 is about 1180.6592019574.

The spelling of 1645787157 in words is "one billion, six hundred forty-five million, seven hundred eighty-seven thousand, one hundred fifty-seven".