1607720516661 has 64 divisors (see below), whose sum is σ = 2523341260800. Its totient is φ = 910095016320.

The previous prime is 1607720516659. The next prime is 1607720516693. The reversal of 1607720516661 is 1666150277061.

It is not a de Polignac number, because 1607720516661 - 2¹ = 1607720516659 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1607720516661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1607720516861) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 69206130 + ... + 69229356.

It is an arithmetic number, because the mean of its divisors is an integer number (39427207200).

Almost surely, 2^{1607720516661} is an apocalyptic number.

It is an amenable number.

1607720516661 is a deficient number, since it is larger than the sum of its proper divisors (915620744139).

1607720516661 is a wasteful number, since it uses less digits than its factorization.

1607720516661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23879 (or 23865 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 48.

The spelling of 1607720516661 in words is "one trillion, six hundred seven billion, seven hundred twenty million, five hundred sixteen thousand, six hundred sixty-one".