70837661 has 2 divisors, whose sum is σ = 70837662. Its totient is φ = 70837660.

The previous prime is 70837651. The next prime is 70837687. The reversal of 70837661 is 16673807.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70728100 + 109561 = 8410^2 + 331^2 .

It is an emirp because it is prime and its reverse (16673807) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70837661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70837651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35418830 + 35418831.

It is an arithmetic number, because the mean of its divisors is an integer number (35418831).

Almost surely, 2^70837661 is an apocalyptic number.

It is an amenable number.

70837661 is a deficient number, since it is larger than the sum of its proper divisors (1).

70837661 is an equidigital number, since it uses as much as digits as its factorization.

70837661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 70837661 is about 8416.5112130859. The cubic root of 70837661 is about 413.7659396384.

The spelling of 70837661 in words is "seventy million, eight hundred thirty-seven thousand, six hundred sixty-one".