1645452651 has 16 divisors (see below), whose sum is σ = 2214950400. Its totient is φ = 1086510240.

The previous prime is 1645452647. The next prime is 1645452691. The reversal of 1645452651 is 1562545461.

It is not a de Polignac number, because 1645452651 - 2² = 1645452647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1645452691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134800 + ... + 146498.

It is an arithmetic number, because the mean of its divisors is an integer number (138434400).

Almost surely, 2^1645452651 is an apocalyptic number.

1645452651 is a deficient number, since it is larger than the sum of its proper divisors (569497749).

1645452651 is a wasteful number, since it uses less digits than its factorization.

1645452651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12146.

The product of its digits is 144000, while the sum is 39.

The square root of 1645452651 is about 40564.1794074526. The cubic root of 1645452651 is about 1180.5792069339.

The spelling of 1645452651 in words is "one billion, six hundred forty-five million, four hundred fifty-two thousand, six hundred fifty-one".