1561632640066 has 8 divisors (see below), whose sum is σ = 2346731318160. Its totient is φ = 779388867348.

The previous prime is 1561632640031. The next prime is 1561632640093. The reversal of 1561632640066 is 6600462361651.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 1561632639998 and 1561632640025.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 713724976 + ... + 713727163.

It is an arithmetic number, because the mean of its divisors is an integer number (293341414770).

Almost surely, 2^{1561632640066} is an apocalyptic number.

1561632640066 is a deficient number, since it is larger than the sum of its proper divisors (785098678094).

1561632640066 is a wasteful number, since it uses less digits than its factorization.

1561632640066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427452688.

The product of its (nonzero) digits is 933120, while the sum is 46.

The spelling of 1561632640066 in words is "one trillion, five hundred sixty-one billion, six hundred thirty-two million, six hundred forty thousand, sixty-six".