66620157408 has 576 divisors, whose sum is σ = 229783042944. Its totient is φ = 17915904000.

The previous prime is 66620157389. The next prime is 66620157451. The reversal of 66620157408 is 80475102666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 368067078 + ... + 368067258.

It is an arithmetic number, because the mean of its divisors is an integer number (398928894).

Almost surely, 2^66620157408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66620157408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114891521472).

66620157408 is an abundant number, since it is smaller than the sum of its proper divisors (163162885536).

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

66620157408 is a wasteful number, since it uses less digits than its factorization.

66620157408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 66620157408 in words is "sixty-six billion, six hundred twenty million, one hundred fifty-seven thousand, four hundred eight".