2061657371678 has 8 divisors (see below), whose sum is σ = 3092578391280. Its totient is φ = 1030797907920.

The previous prime is 2061657371651. The next prime is 2061657371707. The reversal of 2061657371678 is 8761737561602.

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

It is a super-2 number, since 2×2061657371678² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15305138 + ... + 15439253.

It is an arithmetic number, because the mean of its divisors is an integer number (386572298910).

Almost surely, 2^{2061657371678} is an apocalyptic number.

2061657371678 is a deficient number, since it is larger than the sum of its proper divisors (1030921019602).

2061657371678 is a wasteful number, since it uses less digits than its factorization.

2061657371678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30777922.

The product of its (nonzero) digits is 17781120, while the sum is 59.

The spelling of 2061657371678 in words is "two trillion, sixty-one billion, six hundred fifty-seven million, three hundred seventy-one thousand, six hundred seventy-eight".