1261491046615 has 8 divisors (see below), whose sum is σ = 1513963527120. Its totient is φ = 1009076656512.

The previous prime is 1261491046601. The next prime is 1261491046619. The reversal of 1261491046615 is 5166401941621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1261491046615 - 2¹⁵ = 1261491013847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261491046619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14474809 + ... + 14561698.

It is an arithmetic number, because the mean of its divisors is an integer number (189245440890).

Almost surely, 2^{1261491046615} is an apocalyptic number.

1261491046615 is a deficient number, since it is larger than the sum of its proper divisors (252472480505).

1261491046615 is an equidigital number, since it uses as much as digits as its factorization.

1261491046615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29045201.

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 1261491046615 in words is "one trillion, two hundred sixty-one billion, four hundred ninety-one million, forty-six thousand, six hundred fifteen".