66978703 has 6 divisors (see below), whose sum is σ = 73621352. Its totient is φ = 60889620.

The previous prime is 66978701. The next prime is 66978721. The reversal of 66978703 is 30787966.

It is not a de Polignac number, because 66978703 - 2¹ = 66978701 is a prime.

It is a super-2 number, since 2×66978703² = 8972293311124418, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66978701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 276651 + ... + 276892.

Almost surely, 2^66978703 is an apocalyptic number.

66978703 is a deficient number, since it is larger than the sum of its proper divisors (6642649).

66978703 is a wasteful number, since it uses less digits than its factorization.

66978703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553565 (or 553554 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 66978703 is about 8184.0517471482. The cubic root of 66978703 is about 406.1117712602. Note that the first 3 decimals are identical.

It can be divided in two parts, 6697 and 8703, that added together give a triangular number (15400 = T₁₇₅).

The spelling of 66978703 in words is "sixty-six million, nine hundred seventy-eight thousand, seven hundred three".