1665000061551 has 24 divisors (see below), whose sum is σ = 2423182711040. Its totient is φ = 1101613868496.

The previous prime is 1665000061471. The next prime is 1665000061561. The reversal of 1665000061551 is 1551600005661.

It is not a de Polignac number, because 1665000061551 - 2¹⁷ = 1664999930479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665000061561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3221016 + ... + 3702018.

Almost surely, 2^{1665000061551} is an apocalyptic number.

1665000061551 is a deficient number, since it is larger than the sum of its proper divisors (758182649489).

1665000061551 is a wasteful number, since it uses less digits than its factorization.

1665000061551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483915 (or 483912 counting only the distinct ones).

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

The spelling of 1665000061551 in words is "one trillion, six hundred sixty-five billion, sixty-one thousand, five hundred fifty-one".