70520521837 has 4 divisors (see below), whose sum is σ = 70540924636. Its totient is φ = 70500119040.

The previous prime is 70520521831. The next prime is 70520521849. The reversal of 70520521837 is 73812502507.

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 6042108361 + 64478413476 = 77731^2 + 253926^2 .

It is a cyclic number.

It is not a de Polignac number, because 70520521837 - 2³ = 70520521829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 70520521837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70520521831) 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, 10196214 + ... + 10203127.

It is an arithmetic number, because the mean of its divisors is an integer number (17635231159).

Almost surely, 2^70520521837 is an apocalyptic number.

It is an amenable number.

70520521837 is a deficient number, since it is larger than the sum of its proper divisors (20402799).

70520521837 is a wasteful number, since it uses less digits than its factorization.

70520521837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20402798.

The product of its (nonzero) digits is 117600, while the sum is 40.

The spelling of 70520521837 in words is "seventy billion, five hundred twenty million, five hundred twenty-one thousand, eight hundred thirty-seven".