1640535537 has 16 divisors (see below), whose sum is σ = 2204928000. Its totient is φ = 1084947024.

The previous prime is 1640535521. The next prime is 1640535551. The reversal of 1640535537 is 7355350461.

It is not a de Polignac number, because 1640535537 - 2⁴ = 1640535521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1640535495 and 1640535504.

It is not an unprimeable number, because it can be changed into a prime (1640535137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232264 + ... + 239222.

It is an arithmetic number, because the mean of its divisors is an integer number (137808000).

Almost surely, 2^1640535537 is an apocalyptic number.

It is an amenable number.

1640535537 is a deficient number, since it is larger than the sum of its proper divisors (564392463).

1640535537 is a wasteful number, since it uses less digits than its factorization.

1640535537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7580.

The product of its (nonzero) digits is 189000, while the sum is 39.

The square root of 1640535537 is about 40503.5249947458. The cubic root of 1640535537 is about 1179.4020567691.

Adding to 1640535537 its reverse (7355350461), we get a palindrome (8995885998).

The spelling of 1640535537 in words is "one billion, six hundred forty million, five hundred thirty-five thousand, five hundred thirty-seven".