507537661 has 2 divisors, whose sum is σ = 507537662. Its totient is φ = 507537660.

The previous prime is 507537649. The next prime is 507537689. The reversal of 507537661 is 166735705.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 486202500 + 21335161 = 22050^2 + 4619^2 .

It is a cyclic number.

It is not a de Polignac number, because 507537661 - 2¹³ = 507529469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (507537761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253768830 + 253768831.

It is an arithmetic number, because the mean of its divisors is an integer number (253768831).

Almost surely, 2^507537661 is an apocalyptic number.

It is an amenable number.

507537661 is a deficient number, since it is larger than the sum of its proper divisors (1).

507537661 is an equidigital number, since it uses as much as digits as its factorization.

507537661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 132300, while the sum is 40.

The square root of 507537661 is about 22528.5965164277. The cubic root of 507537661 is about 797.6690802164.

The spelling of 507537661 in words is "five hundred seven million, five hundred thirty-seven thousand, six hundred sixty-one".