1650015115661 has 4 divisors (see below), whose sum is σ = 1800016489824. Its totient is φ = 1500013741500.

The previous prime is 1650015115621. The next prime is 1650015115663. The reversal of 1650015115661 is 1665115100561.

It is a happy number.

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 1650015115661 - 2²² = 1650010921357 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 (1650015115663) 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, 75000687065 + ... + 75000687086.

It is an arithmetic number, because the mean of its divisors is an integer number (450004122456).

Almost surely, 2^{1650015115661} is an apocalyptic number.

1650015115661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1650015115661 is a deficient number, since it is larger than the sum of its proper divisors (150001374163).

1650015115661 is a wasteful number, since it uses less digits than its factorization.

1650015115661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150001374162.

The product of its (nonzero) digits is 27000, while the sum is 38.

The spelling of 1650015115661 in words is "one trillion, six hundred fifty billion, fifteen million, one hundred fifteen thousand, six hundred sixty-one".