103215511561 has 16 divisors (see below), whose sum is σ = 107778193920. Its totient is φ = 98730656640.

The previous prime is 103215511513. The next prime is 103215511589. The reversal of 103215511561 is 165115512301.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-103215511561 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (103215511361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13672590 + ... + 13680136.

It is an arithmetic number, because the mean of its divisors is an integer number (6736137120).

Almost surely, 2^103215511561 is an apocalyptic number.

It is an amenable number.

103215511561 is a deficient number, since it is larger than the sum of its proper divisors (4562682359).

103215511561 is an equidigital number, since it uses as much as digits as its factorization.

103215511561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12624.

The product of its (nonzero) digits is 4500, while the sum is 31.

The spelling of 103215511561 in words is "one hundred three billion, two hundred fifteen million, five hundred eleven thousand, five hundred sixty-one".