1646436978332 has 12 divisors (see below), whose sum is σ = 2980618667880. Its totient is φ = 794831644656.

The previous prime is 1646436978283. The next prime is 1646436978337. The reversal of 1646436978332 is 2338796346461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646436978337) 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, 7096710998 + ... + 7096711229.

It is an arithmetic number, because the mean of its divisors is an integer number (248384888990).

Almost surely, 2^{1646436978332} is an apocalyptic number.

It is an amenable number.

1646436978332 is a deficient number, since it is larger than the sum of its proper divisors (1334181689548).

1646436978332 is a wasteful number, since it uses less digits than its factorization.

1646436978332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14193422260 (or 14193422258 counting only the distinct ones).

The product of its digits is 94058496, while the sum is 62.

The spelling of 1646436978332 in words is "one trillion, six hundred forty-six billion, four hundred thirty-six million, nine hundred seventy-eight thousand, three hundred thirty-two".