1506372136561 has 4 divisors (see below), whose sum is σ = 1514177173732. Its totient is φ = 1498567099392.

The previous prime is 1506372136553. The next prime is 1506372136597. The reversal of 1506372136561 is 1656312736051.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 200060292961 + 1306311843600 = 447281^2 + 1142940^2 .

It is a cyclic number.

It is not a de Polignac number, because 1506372136561 - 2³ = 1506372136553 is a prime.

It is a super-4 number, since 4×1506372136561⁴ (a number of 50 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1506372136861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3902518296 + ... + 3902518681.

It is an arithmetic number, because the mean of its divisors is an integer number (378544293433).

Almost surely, 2^{1506372136561} is an apocalyptic number.

It is an amenable number.

1506372136561 is a deficient number, since it is larger than the sum of its proper divisors (7805037171).

1506372136561 is an equidigital number, since it uses as much as digits as its factorization.

1506372136561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7805037170.

The product of its (nonzero) digits is 680400, while the sum is 46.

The spelling of 1506372136561 in words is "one trillion, five hundred six billion, three hundred seventy-two million, one hundred thirty-six thousand, five hundred sixty-one".