615901091261 has 4 divisors (see below), whose sum is σ = 625997830524. Its totient is φ = 605804352000.

The previous prime is 615901091251. The next prime is 615901091297. The reversal of 615901091261 is 162190109516.

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 190658856025 + 425242235236 = 436645^2 + 652106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-615901091261 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 (615901091251) 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, 5048369540 + ... + 5048369661.

It is an arithmetic number, because the mean of its divisors is an integer number (156499457631).

Almost surely, 2^615901091261 is an apocalyptic number.

615901091261 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

615901091261 is a deficient number, since it is larger than the sum of its proper divisors (10096739263).

615901091261 is a wasteful number, since it uses less digits than its factorization.

615901091261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10096739262.

The product of its (nonzero) digits is 29160, while the sum is 41.

The spelling of 615901091261 in words is "six hundred fifteen billion, nine hundred one million, ninety-one thousand, two hundred sixty-one".