1651601661061 has 4 divisors (see below), whose sum is σ = 1801747266624. Its totient is φ = 1501456055500.

The previous prime is 1651601661001. The next prime is 1651601661077. The reversal of 1651601661061 is 1601661061561.

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 1651601661061 - 2²¹ = 1651599563909 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1651601661001) 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, 75072802765 + ... + 75072802786.

It is an arithmetic number, because the mean of its divisors is an integer number (450436816656).

Almost surely, 2^{1651601661061} is an apocalyptic number.

1651601661061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1651601661061 is a deficient number, since it is larger than the sum of its proper divisors (150145605563).

1651601661061 is a wasteful number, since it uses less digits than its factorization.

1651601661061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150145605562.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 1651601661061 in words is "one trillion, six hundred fifty-one billion, six hundred one million, six hundred sixty-one thousand, sixty-one".