3520070067581 has 4 divisors (see below), whose sum is σ = 3541665589632. Its totient is φ = 3498474545532.

The previous prime is 3520070067551. The next prime is 3520070067607. The reversal of 3520070067581 is 1857600700253.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3520070067581 - 2²² = 3520065873277 is a prime.

It is a super-2 number, since 2×3520070067581² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3520070067551) 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, 10797760781 + ... + 10797761106.

It is an arithmetic number, because the mean of its divisors is an integer number (885416397408).

Almost surely, 2^{3520070067581} is an apocalyptic number.

It is an amenable number.

3520070067581 is a deficient number, since it is larger than the sum of its proper divisors (21595522051).

3520070067581 is a wasteful number, since it uses less digits than its factorization.

3520070067581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21595522050.

The product of its (nonzero) digits is 352800, while the sum is 44.

The spelling of 3520070067581 in words is "three trillion, five hundred twenty billion, seventy million, sixty-seven thousand, five hundred eighty-one".