420073251581 has 8 divisors (see below), whose sum is σ = 433690403328. Its totient is φ = 406460250000.

The previous prime is 420073251569. The next prime is 420073251589. The reversal of 420073251581 is 185152370024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 420073251581 - 2⁶ = 420073251517 is a prime.

It is a super-2 number, since 2×420073251581² (a number of 24 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 (420073251589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 831170 + ... + 1237331.

It is an arithmetic number, because the mean of its divisors is an integer number (54211300416).

Almost surely, 2^420073251581 is an apocalyptic number.

It is an amenable number.

420073251581 is a deficient number, since it is larger than the sum of its proper divisors (13617151747).

420073251581 is a wasteful number, since it uses less digits than its factorization.

420073251581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2075083.

The product of its (nonzero) digits is 67200, while the sum is 38.

The spelling of 420073251581 in words is "four hundred twenty billion, seventy-three million, two hundred fifty-one thousand, five hundred eighty-one".