16642020400 has 60 divisors (see below), whose sum is σ = 40040164944. Its totient is φ = 6647200000.

The previous prime is 16642020383. The next prime is 16642020413. The reversal of 16642020400 is 402024661.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 250725 + ... + 310075.

Almost surely, 2^16642020400 is an apocalyptic number.

16642020400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16642020400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20020082472).

16642020400 is an abundant number, since it is smaller than the sum of its proper divisors (23398144544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16642020400 is a wasteful number, since it uses less digits than its factorization.

16642020400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60070 (or 60059 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The spelling of 16642020400 in words is "sixteen billion, six hundred forty-two million, twenty thousand, four hundred".