669567472776 has 320 divisors, whose sum is σ = 2162335824000. Its totient is φ = 192140605440.

The previous prime is 669567472711. The next prime is 669567472807. The reversal of 669567472776 is 677274765966.

669567472776 is a `hidden beast` number, since 6 + 6 + 95 + 67 + 472 + 7 + 7 + 6 = 666.

It is a super-2 number, since 2×669567472776² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6014661 + ... + 6124971.

It is an arithmetic number, because the mean of its divisors is an integer number (6757299450).

Almost surely, 2^669567472776 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 669567472776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1081167912000).

669567472776 is an abundant number, since it is smaller than the sum of its proper divisors (1492768351224).

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

669567472776 is a wasteful number, since it uses less digits than its factorization.

669567472776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110394 (or 110381 counting only the distinct ones).

The product of its digits is 1120210560, while the sum is 72.

The spelling of 669567472776 in words is "six hundred sixty-nine billion, five hundred sixty-seven million, four hundred seventy-two thousand, seven hundred seventy-six".