67061551 has 4 divisors (see below), whose sum is σ = 67208752. Its totient is φ = 66914352.

The previous prime is 67061531. The next prime is 67061563. The reversal of 67061551 is 15516076.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 67061551 - 2¹³ = 67053359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67061531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72915 + ... + 73828.

It is an arithmetic number, because the mean of its divisors is an integer number (16802188).

Almost surely, 2^67061551 is an apocalyptic number.

67061551 is a deficient number, since it is larger than the sum of its proper divisors (147201).

67061551 is a wasteful number, since it uses less digits than its factorization.

67061551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147200.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 67061551 is about 8189.1117344923. Note that the first 3 decimals coincide. The cubic root of 67061551 is about 406.2791462797.

The spelling of 67061551 in words is "sixty-seven million, sixty-one thousand, five hundred fifty-one".