6507661537 has 12 divisors (see below), whose sum is σ = 7053593724. Its totient is φ = 6001245120.

The previous prime is 6507661513. The next prime is 6507661541. The reversal of 6507661537 is 7351667056.

It can be written as a sum of positive squares in 6 ways, for example, as 2364293376 + 4143368161 = 48624^2 + 64369^2 .

It is not a de Polignac number, because 6507661537 - 2¹¹ = 6507659489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6507661507) 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, 161163 + ... + 197455.

It is an arithmetic number, because the mean of its divisors is an integer number (587799477).

Almost surely, 2^6507661537 is an apocalyptic number.

It is an amenable number.

6507661537 is a deficient number, since it is larger than the sum of its proper divisors (545932187).

6507661537 is a wasteful number, since it uses less digits than its factorization.

6507661537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37380 (or 37367 counting only the distinct ones).

The product of its (nonzero) digits is 793800, while the sum is 46.

The square root of 6507661537 is about 80670.0783252378. The cubic root of 6507661537 is about 1866.9885410761.

The spelling of 6507661537 in words is "six billion, five hundred seven million, six hundred sixty-one thousand, five hundred thirty-seven".