70509491645 has 4 divisors (see below), whose sum is σ = 84611389980. Its totient is φ = 56407593312.

The previous prime is 70509491641. The next prime is 70509491653. The reversal of 70509491645 is 54619490507.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54619490507 = 97 ⋅563087531.

It can be written as a sum of positive squares in 2 ways, for example, as 34565502724 + 35943988921 = 185918^2 + 189589^2 .

It is a cyclic number.

It is not a de Polignac number, because 70509491645 - 2² = 70509491641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 70509491593 and 70509491602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70509491641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7050949160 + ... + 7050949169.

It is an arithmetic number, because the mean of its divisors is an integer number (21152847495).

Almost surely, 2^70509491645 is an apocalyptic number.

It is an amenable number.

70509491645 is a deficient number, since it is larger than the sum of its proper divisors (14101898335).

70509491645 is a wasteful number, since it uses less digits than its factorization.

70509491645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14101898334.

The product of its (nonzero) digits is 1360800, while the sum is 50.

The spelling of 70509491645 in words is "seventy billion, five hundred nine million, four hundred ninety-one thousand, six hundred forty-five".