640148160545 has 4 divisors (see below), whose sum is σ = 768177792660. Its totient is φ = 512118528432.

The previous prime is 640148160517. The next prime is 640148160551. The reversal of 640148160545 is 545061841046.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 292992698944 + 347155461601 = 541288^2 + 589199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640148160545 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640148160496 and 640148160505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64014816050 + ... + 64014816059.

It is an arithmetic number, because the mean of its divisors is an integer number (192044448165).

Almost surely, 2^640148160545 is an apocalyptic number.

It is an amenable number.

640148160545 is a deficient number, since it is larger than the sum of its proper divisors (128029632115).

640148160545 is a wasteful number, since it uses less digits than its factorization.

640148160545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128029632114.

The product of its (nonzero) digits is 460800, while the sum is 44.

The spelling of 640148160545 in words is "six hundred forty billion, one hundred forty-eight million, one hundred sixty thousand, five hundred forty-five".