615216606661 has 2 divisors, whose sum is σ = 615216606662. Its totient is φ = 615216606660.

The previous prime is 615216606643. The next prime is 615216606701. The reversal of 615216606661 is 166606612516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 614077544161 + 1139062500 = 783631^2 + 33750^2 .

It is a cyclic number.

It is not a de Polignac number, because 615216606661 - 2⁵ = 615216606629 is a prime.

It is a super-2 number, since 2×615216606661² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (615216616661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307608303330 + 307608303331.

It is an arithmetic number, because the mean of its divisors is an integer number (307608303331).

Almost surely, 2^615216606661 is an apocalyptic number.

It is an amenable number.

615216606661 is a deficient number, since it is larger than the sum of its proper divisors (1).

615216606661 is an equidigital number, since it uses as much as digits as its factorization.

615216606661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 615216606661 in words is "six hundred fifteen billion, two hundred sixteen million, six hundred six thousand, six hundred sixty-one".