1651600005661 has 8 divisors (see below), whose sum is σ = 1664317648224. Its totient is φ = 1638884030160.

The previous prime is 1651600005659. The next prime is 1651600005697. The reversal of 1651600005661 is 1665000061561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1651600005661 - 2¹ = 1651600005659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1651600005661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1651600005641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1610110 + ... + 2428096.

It is an arithmetic number, because the mean of its divisors is an integer number (208039706028).

Almost surely, 2^{1651600005661} is an apocalyptic number.

It is an amenable number.

1651600005661 is a deficient number, since it is larger than the sum of its proper divisors (12717642563).

1651600005661 is a wasteful number, since it uses less digits than its factorization.

1651600005661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833531.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 1651600005661 in words is "one trillion, six hundred fifty-one billion, six hundred million, five thousand, six hundred sixty-one".