66153557400 has 288 divisors, whose sum is σ = 244380764880. Its totient is φ = 14751744000.

The previous prime is 66153557399. The next prime is 66153557411. The reversal of 66153557400 is 475535166.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1177960 + ... + 1232840.

Almost surely, 2^66153557400 is an apocalyptic number.

66153557400 is a gapful number since it is divisible by the number (60) 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 66153557400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122190382440).

66153557400 is an abundant number, since it is smaller than the sum of its proper divisors (178227207480).

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

66153557400 is a wasteful number, since it uses less digits than its factorization.

66153557400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54955 (or 54939 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 42.

The spelling of 66153557400 in words is "sixty-six billion, one hundred fifty-three million, five hundred fifty-seven thousand, four hundred".