17979780477 has 8 divisors (see below), whose sum is σ = 23973719616. Its totient is φ = 11986180832.

The previous prime is 17979780451. The next prime is 17979780493. The reversal of 17979780477 is 77408797971.

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 17979780477 - 2¹¹ = 17979778429 is a prime.

It is a super-2 number, since 2×17979780477² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17979780677) 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, 90433 + ... + 210089.

It is an arithmetic number, because the mean of its divisors is an integer number (2996714952).

Almost surely, 2^17979780477 is an apocalyptic number.

It is an amenable number.

17979780477 is a deficient number, since it is larger than the sum of its proper divisors (5993939139).

17979780477 is a wasteful number, since it uses less digits than its factorization.

17979780477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169747.

The product of its (nonzero) digits is 43563744, while the sum is 66.

The spelling of 17979780477 in words is "seventeen billion, nine hundred seventy-nine million, seven hundred eighty thousand, four hundred seventy-seven".