1642660545 has 16 divisors (see below), whose sum is σ = 2648954880. Its totient is φ = 869186304.

The previous prime is 1642660541. The next prime is 1642660549. The reversal of 1642660545 is 5450662461.

It is an interprime number because it is at equal distance from previous prime (1642660541) and next prime (1642660549).

It is not a de Polignac number, because 1642660545 - 2² = 1642660541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1642660541) 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, 429240 + ... + 433049.

It is an arithmetic number, because the mean of its divisors is an integer number (165559680).

Almost surely, 2^1642660545 is an apocalyptic number.

1642660545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1642660545 is a deficient number, since it is larger than the sum of its proper divisors (1006294335).

1642660545 is a wasteful number, since it uses less digits than its factorization.

1642660545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862424.

The product of its (nonzero) digits is 172800, while the sum is 39.

The square root of 1642660545 is about 40529.7488889334. The cubic root of 1642660545 is about 1179.9110688987.

The spelling of 1642660545 in words is "one billion, six hundred forty-two million, six hundred sixty thousand, five hundred forty-five".