1506540415261 has 4 divisors (see below), whose sum is σ = 1721760474592. Its totient is φ = 1291320355932.

The previous prime is 1506540415243. The next prime is 1506540415291. The reversal of 1506540415261 is 1625140456051.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1506540415261 - 2²⁷ = 1506406197533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1506540415291) 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, 107610029655 + ... + 107610029668.

It is an arithmetic number, because the mean of its divisors is an integer number (430440118648).

Almost surely, 2^{1506540415261} is an apocalyptic number.

It is an amenable number.

1506540415261 is a deficient number, since it is larger than the sum of its proper divisors (215220059331).

1506540415261 is an equidigital number, since it uses as much as digits as its factorization.

1506540415261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215220059330.

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 1506540415261 in words is "one trillion, five hundred six billion, five hundred forty million, four hundred fifteen thousand, two hundred sixty-one".