1551966966 has 80 divisors (see below), whose sum is σ = 3801864528. Its totient is φ = 469281600.

The previous prime is 1551966953. The next prime is 1551966967. The reversal of 1551966966 is 6696691551.

1551966966 is a `hidden beast` number, since 1 + 5 + 519 + 6 + 69 + 66 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551966967) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1519536 + ... + 1520556.

Almost surely, 2^1551966966 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1551966966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1900932264).

1551966966 is an abundant number, since it is smaller than the sum of its proper divisors (2249897562).

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

1551966966 is a wasteful number, since it uses less digits than its factorization.

1551966966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1899 (or 1890 counting only the distinct ones).

The product of its digits is 2624400, while the sum is 54.

The square root of 1551966966 is about 39395.0119431382. The cubic root of 1551966966 is about 1157.7838598990.

The spelling of 1551966966 in words is "one billion, five hundred fifty-one million, nine hundred sixty-six thousand, nine hundred sixty-six".