661061162019 has 16 divisors (see below), whose sum is σ = 973839462912. Its totient is φ = 396749409408.

The previous prime is 661061162017. The next prime is 661061162051. The reversal of 661061162019 is 910261160166.

It is not a de Polignac number, because 661061162019 - 2¹ = 661061162017 is a prime.

It is a super-2 number, since 2×661061162019² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (661061162017) 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, 281781079 + ... + 281783424.

It is an arithmetic number, because the mean of its divisors is an integer number (60864966432).

Almost surely, 2^661061162019 is an apocalyptic number.

661061162019 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

661061162019 is a deficient number, since it is larger than the sum of its proper divisors (312778300893).

661061162019 is a wasteful number, since it uses less digits than its factorization.

661061162019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563564546.

The product of its (nonzero) digits is 23328, while the sum is 39.

The spelling of 661061162019 in words is "six hundred sixty-one billion, sixty-one million, one hundred sixty-two thousand, nineteen".