1451555661 has 16 divisors (see below), whose sum is σ = 1977836544. Its totient is φ = 946515504.

The previous prime is 1451555657. The next prime is 1451555671. The reversal of 1451555661 is 1665551541.

It is not a de Polignac number, because 1451555661 - 2² = 1451555657 is a prime.

It is a super-2 number, since 2×1451555661² = 4214027673962293842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1451555641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 379786 + ... + 383588.

It is an arithmetic number, because the mean of its divisors is an integer number (123614784).

Almost surely, 2^1451555661 is an apocalyptic number.

It is an amenable number.

1451555661 is a deficient number, since it is larger than the sum of its proper divisors (526280883).

1451555661 is a wasteful number, since it uses less digits than its factorization.

1451555661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6560.

The product of its digits is 90000, while the sum is 39.

The square root of 1451555661 is about 38099.2868830901. The cubic root of 1451555661 is about 1132.2558275592.

The spelling of 1451555661 in words is "one billion, four hundred fifty-one million, five hundred fifty-five thousand, six hundred sixty-one".