645015642046 has 4 divisors (see below), whose sum is σ = 967523463072. Its totient is φ = 322507821022.

The previous prime is 645015642043. The next prime is 645015642113. The reversal of 645015642046 is 640246510546.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×645015642046² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645015641993 and 645015642011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645015642041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161253910510 + ... + 161253910513.

It is an arithmetic number, because the mean of its divisors is an integer number (241880865768).

Almost surely, 2^645015642046 is an apocalyptic number.

645015642046 is a deficient number, since it is larger than the sum of its proper divisors (322507821026).

645015642046 is a wasteful number, since it uses less digits than its factorization.

645015642046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322507821025.

The product of its (nonzero) digits is 691200, while the sum is 43.

The spelling of 645015642046 in words is "six hundred forty-five billion, fifteen million, six hundred forty-two thousand, forty-six".