1551000051666 has 48 divisors (see below), whose sum is σ = 3753037177344. Its totient is φ = 477230783184.

The previous prime is 1551000051637. The next prime is 1551000051683. The reversal of 1551000051666 is 6661500001551.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1551000051666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122738226 + ... + 122750861.

It is an arithmetic number, because the mean of its divisors is an integer number (78188274528).

Almost surely, 2^{1551000051666} is an apocalyptic number.

1551000051666 is an abundant number, since it is smaller than the sum of its proper divisors (2202037125678).

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

1551000051666 is a wasteful number, since it uses less digits than its factorization.

1551000051666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245489117 (or 245489105 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 1551000051666 in words is "one trillion, five hundred fifty-one billion, fifty-one thousand, six hundred sixty-six".